when a head penetrates an anal passage for pleasure, of course, and upon removing said head, there is a lining of shit or shit remnants around the head that was inside the ass, as the hairstyle of a monk. However, one must have a shaved head for this to work to the desired result, and butt-monk.
butt-monk. butt-monk is not a good thing, do not try ever. butt-monk, butt-monk.